U.S. patent application number 13/175290 was filed with the patent office on 2012-01-05 for transformer and display device having the same.
This patent application is currently assigned to SAMSUNG ELECTRO-MECHANICS CO., LTD.. Invention is credited to Jong Hae Kim, Young Min Lee, Geun Young Park, Sang Joon Seo, Hwi Beom Shin.
Application Number | 20120001714 13/175290 |
Document ID | / |
Family ID | 44365483 |
Filed Date | 2012-01-05 |
United States Patent
Application |
20120001714 |
Kind Code |
A1 |
Shin; Hwi Beom ; et
al. |
January 5, 2012 |
TRANSFORMER AND DISPLAY DEVICE HAVING THE SAME
Abstract
The present invention relates to an LCD display device, a
transformer, which can be applied to a thin display device, such as
an LED display, and a display device having the same. There are
provided a transformer including: a bobbin part including a primary
bobbin including a first bobbin body having a first through hole
therein, the first bobbin body including a first winding unit
having a coil wound around an outer circumferential surface of the
first through hole, and at least one secondary bobbin including a
second bobbin body having a second through hole therein, the second
bobbin body including a second winding unit having a coil wound
around an outer circumferential surface of the second through hole,
wherein the primary bobbin is inserted into the second through
hole, and a protrusion is formed on at least part of the outer
circumferential surface of the second through hole so that the
protrusion is inserted into the first winding unit of the primary
bobbin; and a core part having a pair of cores electromagnetically
coupled with each other through the first through hole, and a
display device having the same.
Inventors: |
Shin; Hwi Beom; (Jinju,
KR) ; Park; Geun Young; (Suwon, KR) ; Seo;
Sang Joon; (Suwon, KR) ; Lee; Young Min;
(Suwon, KR) ; Kim; Jong Hae; (Suwon, KR) |
Assignee: |
SAMSUNG ELECTRO-MECHANICS CO.,
LTD.
|
Family ID: |
44365483 |
Appl. No.: |
13/175290 |
Filed: |
July 1, 2011 |
Current U.S.
Class: |
336/198 |
Current CPC
Class: |
H01F 2027/065 20130101;
H01F 27/325 20130101; H01F 2005/025 20130101; H01F 27/30
20130101 |
Class at
Publication: |
336/198 |
International
Class: |
H01F 27/30 20060101
H01F027/30 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 2, 2010 |
KR |
10-2010-0063720 |
Claims
1. A transformer comprising: a bobbin part comprising a primary
bobbin including a first bobbin body having a first through hole
therein, the first bobbin body including a first winding unit
having a coil wound around an outer circumferential surface of the
first through hole, and at least one secondary bobbin comprising a
second bobbin body having a second through hole therein, the second
bobbin body including a second winding unit having a coil wound
around an outer circumferential surface of the second through hole,
wherein the primary bobbin is inserted into the second through
hole, and a protrusion is formed on at least part of the outer
circumferential surface of the second through hole so that the
protrusion is inserted into the first winding unit of the primary
bobbin; and a core part having a pair of cores electromagnetically
coupled with each other through the first through hole.
2. The transformer of claim 1, further comprising a coil part
comprising a primary coil wound around the first winding unit of
the primary bobbin and at least one secondary coil wound around the
first winding unit of the at least one secondary bobbin and having
a predetermined turns ratio with respect to the primary coil.
3. The transformer of claim 1, wherein the primary bobbin comprises
a first upper support unit and a first lower support unit
individually supporting the coil while interposing the coil of the
first winding unit therebetween.
4. The transformer of claim 3, wherein the at least one secondary
bobbin comprises a second upper support unit and a second lower
support unit individually supporting the coil while interposing the
coil of the second winding unit therebetween.
5. The transformer of claim 4, wherein the first upper support unit
is longer than the first lower support unit.
6. The transformer of claim 5, wherein the second upper support
unit is longer than the second lower support unit.
7. The transformer of claim 6, wherein the first lower support unit
and the second lower support unit have respective end portions
being curved.
8. The transformer of claim 7, wherein the first lower support unit
and the second lower support unit comprise respective end portions
being curved convexedly from the first winding unit or the second
winding unit toward outside.
9. The transformer of claim 7, wherein the first lower support unit
and the second lower support unit comprise respective end portions
being curved convexedly from outside toward the first winding unit
or the second winding unit.
10. The transformer of claim 6, wherein a cavity is provided within
each of the end portions of the first lower support unit and the
second lower support unit.
11. The transformer of claim 1, wherein the protrusion comprises a
first face extending toward a center of a through hole and a second
face inclined from an end of the first face toward an outer
circumferential surface of the through hole.
12. The transformer of claim 1, wherein the protrusion comprises
first and second faces extending toward a center of a through hole
and a third face connecting ends of the first and second faces.
13. The transformer of claim 12, wherein the third face is inclined
from the end of the first face to the end of the second face.
14. The transformer of claim 12, wherein the third face is curved
from the end of the first face to the end of the second face.
15. The transformer of claim 1, wherein the protrusion comprises a
first face and a second face extending toward a center of a through
hole, a third face extending from an end of the first face, and a
fourth face extending from the end of the second face and connected
to the third face.
16. The transformer of claim 15, wherein the third face is inclined
from the end of the first face to the fourth face, and the fourth
face is inclined from the third face to the end of the second
face.
17. The transformer of claim 16, wherein the third face is curved
from the end of the first face to the fourth face.
18. The transformer of claim 16, wherein the fourth face is curved
from the end of the third face to the end of the second face.
19. The transformer of claim 1, wherein the protrusion comprises
first and second faces extending toward a center of a through hole,
a third face extending from an end of the first face, a fourth face
extending from an end of the second face, and a fifth face
connecting an end of the third face and an end of the fourth
face.
20. The transformer of claim 19, wherein the fifth face is in
parallel with an outer circumferential surface of a through
hole.
21. The transformer of claim 20, wherein the third face is curved
from the end of the first face to the fifth face, and the fourth
face is curved from the end of the second face to the fifth
face.
22. The transformer of claim 1, wherein the bobbin part comprises a
plurality of secondary bobbins, and the plurality of secondary
bobbins comprise bobbin bodies having respective through holes
therein, the bobbin bodies including respective winding units
having coils wound around outer circumferential surfaces of the
respective through holes, wherein the preceding secondary bobbins
are received within the respective through holes, and protrusions
are provided on at least parts of the outer circumferential
surfaces of the respective through holes so that the protrusions
may be inserted into the winding units of the preceding secondary
bobbins.
23. A display device comprising: a panel; a backlight unit
supporting the panel and including a light source; a circuit board
supplying power to the light source included in the backlight unit;
a transformer comprising a bobbin part including a primary bobbin
including a first bobbin body having a first through hole therein,
the first bobbin body including a first winding unit having a coil
wound around an outer circumferential surface of the first through
hole, and at least one secondary bobbin comprising a second bobbin
body having a second through hole therein, the second bobbin body
including a second winding unit having a coil wound around an outer
circumferential surface of the second through hole, wherein the
primary bobbin is inserted into the second through hole, and a
protrusion is provided at least part of the outer circumferential
surface of the second through hole so that the protrusion is
inserted into the first winding unit of the primary bobbin, a core
part having a pair of cores electromagnetically coupled with each
other through the first through hole, the transformer mounted on
the circuit board and supplying the power to the circuit board; and
a back cover engaged with the backlight unit.
24. The display device of claim 23, further comprising a coil part
having a primary coil wound around the first winding unit of the
primary bobbin and at least one secondary coil wound around the
first winding unit of the at least one secondary bobbin and having
a predetermined turns ratio with respect to the primary coil.
25. The display device of claim 23, wherein the primary bobbin
comprises a first upper support unit and a first lower support unit
individually supporting the coil while interposing the coil of the
first winding unit therebetween.
26. The display device of claim 25, wherein the at least one
secondary bobbin comprises a second upper support unit and a second
lower support unit individually supporting the coil while
interposing the coil of the second winding unit therebetween.
27. The display device of claim 26, wherein the first upper support
unit is longer than the first lower support unit.
28. The display device of claim 27, wherein the second upper
support unit is longer than the second lower support unit.
29. The display device of claim 28, wherein the first lower support
unit and the second lower support unit have respective end portions
being curved.
30. The display device of claim 29, wherein the first lower support
unit and the second lower support unit comprise respective end
portions being curved convexedly from the first winding unit or the
second winding unit toward outside.
31. The display device of claim 29, wherein the first lower support
unit and the second lower support unit comprise respective end
portions being curved convexedly from outside toward the first
winding unit or the second winding unit.
32. The display device of claim 28, wherein a cavity is provided
within each of the end portions of the first lower support unit and
the second lower support unit.
33. The display device of claim 23, wherein the protrusion
comprises a first face extending toward a center of a through hole
and a second face inclined from an end of the first face toward an
outer circumferential surface of the through hole.
34. The display device of claim 23, wherein the protrusion
comprises first and second faces extending toward a center of a
through hole and a third face connecting ends of the first and
second faces.
35. The display device of claim 34, wherein the third face is
inclined from the end of the first face to the end of the second
face.
36. The display device of claim 34, wherein the third face is
curved from the end of the first face to the end of the second
face.
37. The display device of claim 23, wherein the protrusion
comprises a first face and a second face extending toward a center
of a through hole, a third face extending from an end of the first
face, and a fourth face extending from the end of the second face
and connected to the third face.
38. The display device of claim 37, wherein the third face is
inclined from the end of the first face to the fourth face, and the
fourth face is inclined from the third face to the end of the
second face.
39. The display device of claim 38, wherein the third face is
curved from the end of the first face to the fourth face.
40. The display device of claim 38, wherein the fourth face is
curved from the end of the third face to the end of the second
face.
41. The display device of claim 23, wherein the protrusion
comprises first and second faces extending toward a center of a
through hole, a third face extending from an end of the first face,
a fourth face extending from an end of the second face, and a fifth
face connecting an end of the third face and an end of the fourth
face.
42. The display device of claim 41, wherein the fifth face is in
parallel with an outer circumferential surface of a through
hole.
43. The display device of claim 42, wherein the third face is
curved from the end of the first face to the fifth face, and the
fourth face is curved from the end of the second face to the fifth
face.
44. The display device of claim 23, wherein the bobbin part
comprises a plurality of secondary bobbins, and the plurality of
secondary bobbins comprise bobbin bodies having respective through
holes therein, the bobbin bodies including respective winding units
having coils wound around outer circumferential surfaces of the
respective through holes, wherein the preceding secondary bobbins
are received within the respective through holes, and protrusions
are provided on at least parts of the outer circumferential
surfaces of the respective through holes so that the protrusions
may be inserted into the winding units of the preceding secondary
bobbins.
45. The display device of claim 23, wherein the circuit board has a
cavity therein, and the transformer is at least partially received
within the cavity.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the priority of Korean Patent
Application No. 10-2010-0063720 filed on Jul. 2, 2010, in the
Korean Intellectual Property Office, the disclosure of which is
incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to an LCD display device, and
more particularly, to a transformer, which can be applied to a thin
display device such as an LED display device, and a display device
having the same.
[0004] 2. Description of the Related Art
[0005] Recently, in the display industry, flat panel displays
(FPDs) of utilizing new technologies have attracted attention as a
substitute for cathode ray tubes (CRTs) since they are appropriate
for high-resolution, large screen multimedia systems.
[0006] In particular, in the case of large displays, liquid crystal
display TVs have gained attraction and are expected to receive
wider attention in the future in terms of price and
marketability.
[0007] Existing panel display TVs have used cold cathode
fluorescent lamps (CCFLs) as backlight light sources. However, the
use of light emitting diodes (LEDs) has gradually increased due to
various kinds of advantages including low power consumption, long
effective lifespan, and environmental friendliness.
[0008] As backlight units using LEDs have been reduced in cost and
size, flat panel TVs have also been reduced in thickness, and the
internal power of flat panel TVs has slimmed down.
[0009] A display device according to the related art includes a
panel, a backlight unit supporting the panel, a circuit board
supplying power to a light source of the backlight unit, a
transformer mounted onto the circuit board and supplying the power
to the circuit board, and a back cover coupled to the backlight
unit and covering the circuit board and the transformer.
[0010] As a display device is gradually reduced in thickness, a
back cover, formed of a conductive material, such as an iron plate,
which can be reduced in size, has been used, instead of a back
cover, made of thick plastic.
[0011] In addition, in order to reduce the thickness of the display
device, the distance between the circuit board, mounted on the
circuit board, and the back cover is gradually reduced.
[0012] In this situation, a reduction in distance between the
transformer and the back cover may cause problems as follows.
[0013] First, the thickness of the transformer needs to be reduced
in order to prevent a contact between the transformer and the back
cover as the distance between the transformer and the back cover is
reduced. However, in general, since transformers are manually
manufactured, manufacturing costs are increased and productivity is
decreased as a reduction in the thickness of transformers becomes
greater.
[0014] Further, since the transformer and the back cover are
positioned close to each other, magnetic flux is generated between
the transformer and the back cover, and thus, the conductive back
cover may consume power. That is, in the case in which the back
cover is a conductive back cover, formed of an iron plate, the
magnetic flux, generated by the transformer, is created by the back
cover due to magnetic interference between the transformer of the
circuit board and the conductive back cover. As a result, power
consumption occurs as the back cover consumes power, thereby
increasing the total power consumption and increasing the
temperature of the transformer.
SUMMARY OF THE INVENTION
[0015] An aspect of the present invention provides an LCD display
device, a transformer, which can be applied to a thin display
device, such as an LED display device, and a display device having
the same.
[0016] According to an aspect of the present invention, there is
provided a transformer including: a bobbin part including a primary
bobbin including a first bobbin body having a first through hole
therein, the first bobbin body including a first winding unit
having a coil wound around an outer circumferential surface of the
first through hole, and at least one secondary bobbin including a
second bobbin body having a second through hole therein, the second
bobbin body including a second winding unit having a coil wound
around an outer circumferential surface of the second through hole,
wherein the primary bobbin is inserted into the second through
hole, and a protrusion is formed on at least part of the outer
circumferential surface of the second through hole so that the
protrusion is inserted into the first winding unit of the primary
bobbin; and a core part having a pair of cores electromagnetically
coupled with each other through the first through hole.
[0017] The transformer may further include a coil part including a
primary coil wound around the first winding unit of the primary
bobbin and at least one secondary coil wound around the first
winding unit of the at least one secondary bobbin and having a
predetermined turns ratio with respect to the primary coil.
[0018] The primary bobbin may include a first upper support unit
and a first lower support unit individually supporting the coil
while interposing the coil of the first winding unit
therebetween.
[0019] The at least one secondary bobbin may include a second upper
support unit and a second lower support unit individually
supporting the coil while interposing the coil of the second
winding unit therebetween.
[0020] The first upper support unit may be longer than the first
lower support unit.
[0021] The second upper support unit may be longer than the second
lower support unit.
[0022] The first lower support unit and the second lower support
unit may have respective end portions being curved.
[0023] The first lower support unit and the second lower support
unit may include respective end portions being curved convexedly
from the first winding unit or the second winding unit toward
outside.
[0024] The first lower support unit and the second lower support
unit may include respective end portions being curved convexedly
from outside toward the first winding unit or the second winding
unit.
[0025] A cavity may be provided within each of the end portions of
the first lower support unit and the second lower support unit.
[0026] The protrusion may include a first face extending toward a
center of a through hole and a second face inclined from an end of
the first face toward an outer circumferential surface of the
through hole.
[0027] The protrusion may include first and second faces extending
toward a center of a through hole and a third face connecting ends
of the first and second faces.
[0028] The third face may be inclined from the end of the first
face to the end of the second face.
[0029] The third face may be curved from the end of the first face
to the end of the second face.
[0030] The protrusion may include a first face and a second face
extending toward a center of a through hole, a third face extending
from an end of the first face, and a fourth face extending from the
end of the second face and connected to the third face.
[0031] The third face may be inclined from the end of the first
face to the fourth face, and the fourth face may be inclined from
the third face to the end of the second face.
[0032] The third face may be curved from the end of the first face
to the fourth face.
[0033] The fourth face may be curved from the end of the third face
to the end of the second face.
[0034] The protrusion may include first and second faces extending
toward a center of a through hole, a third face extending from an
end of the first face, a fourth face extending from an end of the
second face, and a fifth face connecting an end of the third face
and an end of the fourth face.
[0035] The fifth face may be disposed to be parallel with an outer
circumferential surface of a through hole.
[0036] The third face may be curved from the end of the first face
to the fifth face, and the fourth face may be curved from the end
of the second face to the fifth face.
[0037] The bobbin part may include a plurality of secondary
bobbins, and the plurality of secondary bobbins may include bobbin
bodies having respective through holes therein, the bobbin bodies
including respective winding units having coils wound around outer
circumferential surfaces of the respective through holes, wherein
the preceding secondary bobbins are received within the respective
through holes, and protrusions are provided on at least parts of
the outer circumferential surfaces of the respective through holes
so that the protrusions may be inserted into the winding units of
the preceding secondary bobbins.
[0038] According to another aspect of the present invention, there
is provided a display device including: a panel; a backlight unit
supporting the panel and including a light source; a circuit board
supplying power to the light source included in the backlight unit;
a transformer comprising a bobbin part including a primary bobbin
including a first bobbin body having a first through hole therein,
the first bobbin body including a first winding unit having a coil
wound around an outer circumferential surface of the first through
hole, and at least one secondary bobbin including a second bobbin
body having a second through hole therein, the second bobbin body
including a second winding unit having a coil wound around an outer
circumferential surface of the second through hole, wherein the
primary bobbin is inserted into the second through hole, and a
protrusion is provided at least part of the outer circumferential
surface of the second through hole so that the protrusion is
inserted into the first winding unit of the primary bobbin, a core
part having a pair of cores electromagnetically coupled with each
other through the first through hole, the transformer mounted on
the circuit board and supplying the power to the circuit board; and
a back cover engaged with the backlight unit.
[0039] The display device may further include a coil part having a
primary coil wound around the first winding unit of the primary
bobbin and at least one secondary coil wound around the first
winding unit of the at least one secondary bobbin and having a
predetermined turns ratio with respect to the primary coil.
[0040] The primary bobbin may include a first upper support unit
and a first lower support unit individually supporting the coil
while interposing the coil of the first winding unit
therebetween.
[0041] The at least one secondary bobbin may include a second upper
support unit and a second lower support unit individually
supporting the coil while interposing the coil of the second
winding unit therebetween.
[0042] The first upper support unit may be longer than the first
lower support unit.
[0043] The second upper support unit may be longer than the second
lower support unit.
[0044] The first lower support unit and the second lower support
unit may have respective end portions being curved.
[0045] The first lower support unit and the second lower support
unit may include respective end portions being curved convexedly
from the first winding unit or the second winding unit toward
outside.
[0046] The first lower support unit and the second lower support
unit may include respective end portions being curved convexedly
from outside toward the first winding unit or the second winding
unit.
[0047] A cavity may be provided within each of the end portions of
the first lower support unit and the second lower support unit.
[0048] The protrusion may include a first face extending toward a
center of a through hole and a second face inclined from an end of
the first face toward an outer circumferential surface of the
through hole.
[0049] The protrusion may include first and second faces extending
toward a center of a through hole and a third face connecting ends
of the first and second faces.
[0050] The third face may be inclined from the end of the first
face to the end of the second face.
[0051] The third face may be curved from the end of the first face
to the end of the second face.
[0052] The protrusion may include a first face and a second face
extending toward a center of a through hole, a third face extending
from an end of the first face, and a fourth face extending from the
end of the second face and connected to the third face.
[0053] The third face may be inclined from the end of the first
face to the fourth face, and the fourth face may be inclined from
the third face to the end of the second face.
[0054] The third face may be curved from the end of the first face
to the fourth face.
[0055] The fourth face may be curved from the end of the third face
to the end of the second face.
[0056] The protrusion may include first and second faces extending
toward a center of a through hole, a third face extending from an
end of the first face, a fourth face extending from an end of the
second face, and a fifth face connecting an end of the third face
and an end of the fourth face.
[0057] The fifth face may be disposed to be parallel with an outer
circumferential surface of a through hole.
[0058] The third face may be curved from the end of the first face
to the fifth face, and the fourth face may be curved from the end
of the second face to the fifth face.
[0059] The bobbin part may include a plurality of secondary
bobbins, and the plurality of secondary bobbins may include bobbin
bodies having respective through holes therein, the bobbin bodies
including respective winding units having coils wound around outer
circumferential surfaces of the respective through holes, wherein
the preceding secondary bobbins are received within the respective
through holes, and protrusions are provided on at least parts of
the outer circumferential surfaces of the respective through holes
so that the protrusions may be inserted into the winding units of
the preceding secondary bobbins.
[0060] The circuit board may have a cavity therein, and the
transformer may be at least partially received within the
cavity.
BRIEF DESCRIPTION OF THE DRAWINGS
[0061] The above and other aspects, features and other advantages
of the present invention will be more clearly understood from the
following detailed description taken in conjunction with the
accompanying drawings, in which:
[0062] FIG. 1 is an exploded perspective view illustrating a
transformer according to an exemplary embodiment of the present
invention;
[0063] FIG. 2 is a perspective view illustrating a transformer in
which bobbins are engaged with each other according to an exemplary
embodiment of the present invention;
[0064] FIG. 3 is a cross-sectional view taken the direction A-A' of
the transformer of FIG. 2;
[0065] FIGS. 4A through 4C are views exemplifying a transformer in
which bobbins are engaged with each other according to an exemplary
embodiment of the present invention;
[0066] FIGS. 5A and 5B are partial enlarged views of FIG. 4;
[0067] FIGS. 5C and 5D are views illustrating a transformer
according to an exemplary embodiment of the present invention;
[0068] FIGS. 6A and 6B are views exemplifying a transformer in
which bobbins are engaged with each other in another manner
according to an exemplary embodiment of the present invention;
[0069] FIGS. 7A and 7B are partial enlarged views of FIG. 6;
[0070] FIGS. 7C and 7D are views illustrating a transformer
according to another exemplary embodiment of the present
invention;
[0071] FIG. 8 is a display device using a transformer according to
an exemplary embodiment of the present invention;
[0072] FIG. 9 is a cross-sectional view taken along the direction
A-A' of a display device according to an exemplary embodiment of
the present invention; and
[0073] FIG. 10 is a view illustrating the electrical effects of a
display device having a transformer according to an exemplary
embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0074] Exemplary embodiments of the present invention will now be
described in detail with reference to the accompanying
drawings.
[0075] FIG. 1 is an exploded perspective view illustrating a
transformer according to an exemplary embodiment of the invention.
FIG. 2 is a perspective view illustrating a transformer in which
bobbins are engaged with each other according to an exemplary
embodiment of the invention. FIG. 3 is a cross-sectional view taken
along the direction A-A' of the transformation as shown in FIG.
2.
[0076] Referring to FIGS. 1 through 3, a transformer according to
this embodiment may include a core part 110, a bobbin part 120, and
a coil part 130.
[0077] The core part 110 may be formed by coupling EE cores and EI
cores with each other and include a first core 111 and a second
core 112 that are electromagnetically coupled through through holes
in the bobbin part 120.
[0078] The bobbin part 120 may include a primary bobbin 121 and one
or more secondary bobbins 122 and 123. The one or more secondary
bobbins 122 and 123 may have a first secondary bobbin 122 and a
second secondary bobbin 123. Alternatively, though not shown in the
drawings, the one or more secondary bobbins 122 and 123 may have a
plurality of secondary bobbins.
[0079] The primary bobbin 121 may have a first bobbin body, which
may have a first through hole H1 therein. The first core 111 and
the second core 112 of the core part 110 may at least be
electromagnetically coupled with each other through the first
through hole H1.
[0080] The primary bobbin 121 may include a first winding unit 121a
having a coil wound around an outer circumferential surface of the
first through hole H1. A primary coil 131 may be wound around the
first winding unit 121a. The primary bobbin 121 may be inserted
into a second through hole H2 of the first secondary bobbin 122.
The first winding unit 121a of the primary bobbin 121 may be
inserted into an outer circumferential surface of the second
through hole H2 of the first secondary bobbin 122 to thereby form a
first protrusion 122b that engages the primary bobbin 121 and the
first secondary bobbin 122 with each other.
[0081] That is, the first secondary bobbin 122 may have a second
bobbin body, which may have the second through hole H2 therein. The
primary bobbin 121 may be inserted into the second through hole H2,
so that the first secondary bobbin 122 and the primary bobbin 121
may be engaged with each other. The first protrusion 122b for
engagement may be formed on the outer circumferential surface of
the second through hole H2 of the first secondary bobbin 122. The
first protrusion 122b may be inserted into the first winding unit
121a of the primary bobbin 121. The first secondary bobbin 122 may
include a second winding unit 122a having a first secondary coil
132 wound around the outer circumferential surface of the second
through hole H2.
[0082] In the same manner, the second secondary bobbin 123 may be
included in the bobbin part 120, the second secondary bobbin 123
may have a third bobbin body, and the third bobbin body may have a
third through hole H3 therein. The first secondary bobbin 122 may
be inserted into the third through hole H3, so that the second
secondary bobbin 123 and the first secondary bobbin 122 may be
engaged with each other. A second protrusion 123b for engagement
may be formed on an outer circumferential surface of the third
through hole H3 of the second secondary bobbin 123. The second
protrusion 123b may be inserted into the second winding unit 122a
of the first secondary bobbin 122. The second secondary bobbin 123
may include a tertiary winding unit 123a having a second secondary
coil 133 wound around the outer circumferential surface of the
third through hole H3.
[0083] The coil part 130 may have a primary coil 131 and at least
one or more secondary coils 132 and 133 that are wound around the
first winding unit 121a of the primary bobbin 121. The number of at
least one or more secondary coils 132 and 133 may correspond to the
number of secondary bobbins included in the one or more secondary
bobbins 122 and 123. That is, when the first secondary bobbin 122
is provided, the first secondary coil 132 may be wound around the
second winding unit 122a. When the secondary bobbins 122 and 123
are provided, the first secondary coil 132 may be wound around the
second winding unit 122a, and the second secondary coil 133 may be
wound around the tertiary winding unit 123a.
[0084] FIGS. 4A through 4C are views exemplifying a transformer in
which bobbins are engaged with each other according to an exemplary
embodiment of the invention. FIGS. 5A and 5B are partial enlarged
views of FIG. 4, and FIGS. 5C and 5D are views illustrating a
transformer according to an exemplary embodiment of the
invention.
[0085] Referring to FIGS. 4 and 5, a transformer according to this
embodiment may have a plurality of bobbins engaged with each other
through holes. Referring to FIGS. 4A through 4C, the first
secondary bobbin 122 may be inserted into the through hole of the
second secondary bobbin 123, and the primary bobbin 121 may be
inserted into the through hole of the first secondary bobbin 122.
Here, the primary bobbin 121 may be inserted into the through hole
of the first secondary bobbin 122 at an angle, so that one side of
the primary bobbin 121 may be engaged with the first protrusion
122b of the first secondary bobbin 122, while the other side of the
primary bobbin 121 may be engaged with the first protrusion 122b of
the first secondary bobbin 122.
[0086] Here, support units, used to support coils wound around
winding units, may be formed. These support units may have an upper
support unit and a lower support unit. Meanwhile, referring to FIG.
1, recesses G may be formed in the support units in order to
satisfy an insulating distance between primary and secondary
bobbins.
[0087] Referring to FIGS. 5A through 5D, for example, the primary
bobbin 121 may include a first upper support unit 121b and a second
lower support unit 121c. As shown in FIG. 5B, for the smooth
engagement of the primary bobbin 121, a length L2 of an end portion
of the second lower support unit 121C may be smaller than a length
L1 of an end portion of the first upper support unit 121b.
Furthermore, for the smooth engagement thereof, the end portion of
the first lower support unit may be curved. More specifically, the
end portion thereof may be curved convexedly upward.
[0088] The first protrusion 122b of the first secondary bobbin 122
is inserted into the first winding unit 121a of the primary bobbin
121, so that the primary bobbin 121 and the first secondary bobbin
122 can be engaged with each other as shown in FIG. 5B.
[0089] As shown in FIG. 5A, the first protrusion 122b may have a
first face a, a second face b, and a third face c along the outer
circumferential surface of the second through hole H2. Namely, the
first protrusion 122b includes the first face a and the second face
b extending from the outer circumferential surface of the second
through hole H2 toward the center of the second through hole H2,
and the third face c to which the end, facing the center of the
second through hole H2, of the first face a is connected, so the
section of the first protrusion 121a may substantially have the
shape of trapezoid. In more detail, the first face a and the second
face b may be disposed to be parallel with each other and extend
from the outer circumferential surface of the second through hole
H2 toward the first winding unit 121a, while the third face c may
be connected from the end of the second face b to the end of the
first face a, be inclined, and be curved convex.
[0090] Furthermore, as shown in FIG. 5D, the third face c of the
first protrusion 122b may be curved convexedly toward the first
winding unit 121a. As shown in FIG. 5C, the first protrusion 122b
may have a first face a, a second face b, a third face c, a fourth
face d, and a fifth face e along the outer circumferential surface
of the second through hole H2. Namely, the first protrusion 122b
has a first face a and second face b extending toward the center of
the second through hole H2 from an outer circumferential surface of
the second through hole H2, a third face c extending from the end,
facing the center of the second through hole H2, of the first face
a, a fourth face d extending from the end, facing the center of the
second through hole H2, of the second face b, and a fifth face e
having one end connected to an end, the opposite to one surface
connected to the first face a, of the third face c and the other
end connected to an end, the opposite to one surface connected to
the second face b, of the fourth face d, so the first protrusion
122b may have a substantially hexagonal sectional shape. In more
detail, the first face a and the second face b may be disposed to
be parallel with each other and extend from the outer
circumferential surface of the second through hole H2 toward the
first winding unit 121a. The third face c may be inclined
downwardly from the end of the first face a, the fourth face d may
be inclined upwardly from the end of the second face b, and the
fifth face e may connect the end of the third face c and the end of
the fourth face d.
[0091] FIGS. 6A and 6B are views exemplifying a transformer in
which bobbins are engaged with each other according to an exemplary
embodiment of the invention. FIGS. 7A and 7B are partial enlarged
views of FIG. 6. FIGS. 7C and 7D are views illustrating a
transformer according to another exemplary embodiment of the
invention.
[0092] Referring to FIGS. 6 and 7, a transformer according to this
embodiment may have a plurality of bobbins engaged with each other
through holes. Referring to FIGS. 6A and 6B, the first secondary
bobbin 122 may be inserted into the through hole of the second
secondary bobbin 123, and the primary bobbin 121 may be inserted
into the through hole of the first secondary bobbin 122. Here, the
primary bobbin 121 may be inserted into the through hole of the
first secondary bobbin 122 at a time by a force being applied from
top to bottom.
[0093] The foregoing combination may be formed as the winding unit
and the protrusion, and the protrusion may have a first face
extending toward the center of the through hole from an outer
circumferential surface of the through hole and a second face
inclined to the outer circumferential surface of the through hole
from the end facing the center of the through hole, substantially
having a triangular section.
[0094] Referring to FIG. 7A, for example, the primary bobbin 121
may include the first upper support unit 121b and the second lower
support unit 121c. As shown in FIG. 7B, for the smooth engagement
of the primary bobbin 121, the length L2 of the end portion of the
second lower support unit 121C may be smaller than the length L1 of
the end portion of the first upper support unit 121b. Furthermore,
for the smooth engagement thereof, the end portion of the second
lower support unit may be curved. Specifically, the end portion
thereof may be curved convexedly downward. Furthermore, as shown in
FIG. 7D, a cavity 121d may be formed in order to exert an elastic
force to the second lower support unit 121c.
[0095] As shown in FIG. 7A, the first protrusion 122b may have a
first face a, a second face b, and a third face c along the outer
circumferential surface of the second through hole H2. The first
face a and the second face b may be disposed to be parallel with
each other and extend from the outer circumferential surface of the
second through hole H2 toward the first winding unit 121a. The
third face c connects the end of the first face a and the end of
the second face b and may be inclined. Furthermore, as shown in
FIG. 7C, the first protrusion 122b may have a first face a, a
second face b, a third face c, and a fourth face d along the outer
circumferential surface of the second through hole H2. The first
protrusion 122b has the first face a and the second face b
extending toward the center of the through hole H2 from the outer
circumferential surface of the through hole H2, the third face c
extending from the end, facing the center of the through hole H2,
of the first face a, and the fourth face d extending from the end,
facing the center of the through hole H2, of the second face b, and
connected to one end of the third face c, so the first protrusion
122b may have a substantially pentagonal sectional shape. In
detail, the first face a and the second face b may be disposed to
be parallel with each other and extend from the outer
circumferential surface of the second through hole H2 toward the
first winding unit 121a, the third face c may be inclined from the
end of the first face a, and the fourth face d may connect the end
of the second face b and the end of the third face c and be curved
convexedly.
[0096] FIG. 8 is a display device using a transformer according to
an exemplary embodiment of the invention. FIG. 9 is a
cross-sectional view taken along the direction A-A' of a display
device according to an exemplary embodiment of the invention.
[0097] Referring to FIG. 8, a display device using a transformer
according to an exemplary embodiment of the invention may include a
panel 300, a backlight unit 400 supporting the panel 300 and
including a light source, a circuit board 200 supplying power to a
light source included in the backlight unit 400, the transformer
100 supplying the power to the circuit board 200, and a back cover
500 to be engaged with the backlight unit 400.
[0098] The panel 300 maybe an LCD panel. However, the present
invention is not limited thereto.
[0099] For example, when panel 300 is composed of an LCD panel, the
backlight unit 400 may include a lamp, which serves as the light
source, a light guide panel, a plurality of sheets, a lamp
reflector, and a mold frame (or a support main).
[0100] Here, the plurality of sheets may include reflection sheets,
diffusion sheets, prism sheets, and protection sheets.
[0101] Meanwhile, as for the light source of the backlight unit
400, a light emitting diode (LED) may be used. In addition to the
transformer 100, power devices, power components, and power-related
circuits, which are necessary to supply power to a display device
according to an exemplary embodiment of the invention, may be
provided on the circuit board 200.
[0102] Referring to FIGS. 3 and 9, a cavity HO may be formed in the
circuit board 200 so that at least part of the transformer 100 may
be received within the cavity HO. The core part 110 of the
transformer 100 may be partially received within the cavity HO and
may transmit and receive power to the circuit board 200 through
pins of the bobbin part 120 and be fixed thereto.
[0103] FIG. 10 is a view illustrating the electrical effects of a
display device using a transformer according to an exemplary
embodiment of the invention.
[0104] Referring to FIG. 10, the transformer 100 according to this
embodiment generates magnetic flux in a direction indicated by a
reference character B, so that a direction of currents may be
determined as indicated by a reference character A, thereby
reducing electromagnetic interference between the transformer 100
and the back cover 500. Therefore, a separate shielding device may
not be used.
[0105] As set forth above, according to exemplary embodiments of
the invention, a thin transformer may be configured to have a
plurality bobbins engaged with each other, thereby achieving the
automation of transformers. A transformer being manufactured in
this manner is used in a thin display device to thereby remove
electromagnetic interference between the transformer and a case of
the display device. As a result, a separate shielding device is not
used, so that manufacturing costs are reduced, and a more reduction
in thickness of the display device can be achieved.
[0106] While the present invention has been shown and described in
connection with the exemplary embodiments, it will be apparent to
those skilled in the art that modifications and variations can be
made without departing from the spirit and scope of the invention
as defined by the appended claims.
* * * * *